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                [Neerc2013 North]flight                </h1>
                <p>时间限制：3s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：256MB</p>			</div>
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                                <h3>题目描述</h3><p><div>Peter是Byteland机场的经理。他的工作就是优化登机过程。Byteland的飞机有s排，编号1</div>
<div>到s。每排6个座位，标号A到F。</div>
<div><img src="../file/4493_0.png" width="577" height="214" alt="" /></div>
<div>有n个乘客，他们排成队伍，一个个登机。如果第i个人坐在ri排，那么他登机的难度相当于</div>
<div>在他之前登机并且坐在第1...ri-1排的人的人数。登机总难度相当于所有乘客的难度的总和。</div>
<div>例如，如果有10个乘客，并且他们的座位是6A,4B,2E,5F,2A,3F,1C,10E,8B,5A,按排队顺序，</div>
<div>那么他们登机的难度为0,0,0,2,0,2,0,7,7,5，总难度为23。</div>
<div>为了优化登机过程，Peter想把飞机分成k个区域，每个区域必须是连续的几排座位。然后登机</div>
<div>过程就分为k个阶段。在每个阶段，挑出一个区域，在这个区域的乘客按照原来排队的顺序登机。</div>
<div>在上面的例子中，如果我们把飞机分成两块区域，5&mdash;10排和1&mdash;4排。那么在第一阶段，乘客</div>
<div>会依次坐6A,5F,10E,8B,5A；在第二阶段，乘客会依次坐4B,2E,2A,3F,1C。通过这样划分，登机总难</div>
<div>度变成了6。</div>
<div>已知乘客的排队顺序，帮助Peter把飞机分成k个区域，使登机总难度最小。</div>
<p></p></p><hr/><h3>输入格式</h3><p><div>第一行包括3个正整数n,s,k。</div>
<div>下一行包括n个正整数ri，每排座位最多容纳6个乘客。</div>
<div>N&lt;=1000,M&lt;=1000,K&lt;=50</div>
<div></div>
<p></p></p><hr/><h3>输出格式</h3><p><div>包含一个正整数，表示最小登机总难度。</div>
<p></p></p><hr/><h3>样例输入</h3><pre>10 12 2
6 4 2 5 2 3 1 11 8 5</pre><hr/><h3>样例输出</h3><pre>6
</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>没有写明来源</p>
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